AIDS-212747 AIDS212747 Dithiane-cyclolignanolide deriv. Spiro[1,3-dithiane-2,7'-[7H,10H]naphtho[1',8':4,5,6]cyclohepta[1,2-c]furan]-10'-one, 7'a,8',10'a,11'-tetrahydro-11'-(3,4,5-trimethoxyphenyl)-, (7a'S,10a'S,11'R)-